UL Fire Rated Five Knuckle Wooden Door Hinge - DDSS007-FR
Product Overview
The UL Fire Rated Five Knuckle Wooden Door Hinge (Model: DDSS007-FR) from D&D HARDWARE is a critical safety component designed for wooden doors in commercial, residential, and public buildings. As a core part of our door hardware portfolio, this hinge undergoes rigorous testing and certification by Underwriters Laboratories (UL), meeting strict 3-hour fire safety standards—ensuring compliance with global building codes and regulations.
Featuring a five-knuckle (five-finger joint) design, the hinge delivers exceptional strength and durability, making it ideal for heavy-duty wooden doors that require long-term reliability. Crafted to pair seamlessly with other D&D products like door locks, door closers, and panic exit devices, it forms a comprehensive door safety system for diverse project needs.
Product Images and Videos
Technical Specifications
- Model Number: DDSS007-FR
- Brand: D&D HARDWARE
- Fire Rating: UL Listed 3 Hours Fire-Rated
- Dimensions: 5.0"x3.0"x3.0mm, 5.0"x3.5"x3.0mm, 5.0"x4.0"x3.0mm (length x width x thickness)
- Material: High-quality stainless steel (compatible with SUS304/SUS316 for enhanced corrosion resistance, upon request)
- Design: Five knuckle (five-finger joint) structure
- Warranty: 5 Years Mechanical Warranty
- Supply Capacity: 200,000 pieces per month
Product Features & Advantages
- UL 3-Hour Fire Certification: Rigorously tested by UL to withstand fire for up to 3 hours, preventing door failure and slowing fire spread—critical for life safety and building code compliance.
- Five-Knuckle Strength: The five-knuckle design distributes weight and stress evenly, enhancing load-bearing capacity (supports heavy wooden doors up to 150lbs) and reducing wear over time compared to standard 3-knuckle hinges.
- Durable Stainless Steel Construction: Made with premium stainless steel to resist rust, corrosion, and deformation—suitable for both indoor (e.g., hospitals, offices) and covered outdoor applications.
- Seamless System Compatibility: Works in tandem with D&D’s door closers, door locks, and panic hardware to create a unified, high-performance door safety system—no need to source components from multiple suppliers.
- Low-Maintenance Design: Precision machining ensures smooth door operation with minimal friction; requires no frequent lubrication or adjustments, lowering long-term maintenance costs for end-users.
How to Install the Hinge (Step-by-Step)
- Prepare Tools & Materials: Gather a drill, screwdriver, measuring tape, pencil, and the UL fire-rated hinge (ensure all parts—hinge leaves, pins, screws—are included).
- Mark Hinge Positions: For wooden doors, measure and mark 3 hinge locations (typically 7" from the top, 11" from the bottom, and centered between the two) on both the door and door frame.
- Attach Hinge Leaves: Align one hinge leaf with the marks on the door frame, drill pilot holes, and secure with screws. Repeat to attach the matching leaf to the door.
- Fit the Hinge Pin: Lift the door and align the hinge leaves; insert the hinge pin to connect them. Ensure the door swings smoothly without sticking.
- Test Fire Resistance (Post-Installation): For project compliance, verify the hinge works with the door’s fire-rated system (pair with D&D’s door seals if needed) and confirm alignment meets local fire codes.
Application Scenarios
This UL fire-rated five-knuckle hinge is engineered for wooden doors in environments where safety, durability, and code compliance are non-negotiable. Key application scenarios include:
- Commercial Buildings: Offices, malls, supermarkets, and warehouses (paired with panic exit devices for emergency egress).
- Public Facilities: Schools, hospitals, and parks (resists heavy use and meets health/safety standards).
- Residential Properties: Villas, apartments, and farmhouses (enhances home safety while matching modern/traditional door handle designs).
- High-Traffic Areas: Entry doors, laundry rooms, and exterior covered doors (stainless steel construction withstands daily wear and moisture).
Value for Buyers: By choosing this hinge, you avoid costly code violations, reduce maintenance expenses (via 5-year warranty), and streamline procurement (as part of D&D’s full door hardware lineup). It also enhances end-product safety, making your projects more competitive in global markets.
Certifications and Compliance
- UL Listing: Officially UL Listed with 3-hour fire rating, meeting ANSI/BHMA standards for fire door components.
- ISO 9001 Compliance: Manufactured under D&D’s ISO 9001-certified quality management system, ensuring consistent performance across every unit.
- Global Building Codes: Adheres to fire safety regulations in North America, Europe, the Middle East, and Asia—suitable for export to 60+ countries D&D serves.
Customization Options
To meet diverse project needs, D&D offers flexible customization for this hinge:
- Size Customization: Adjust dimensions beyond standard options (e.g., thicker gauge for extra-heavy doors) based on your requirements.
- Material Upgrades: Upgrade from standard stainless steel to SUS316 for enhanced corrosion resistance (ideal for coastal or high-moisture areas).
- Finish Matching: Choose finishes (e.g., satin nickel, black) to align with your door knobs or door locksets.
- Packaging Customization: Opt for white boxes, color boxes, or branded cartons to match your company’s packaging standards.
Production Process & Quality Control
D&D’s production process ensures every hinge meets UL standards and our strict quality benchmarks:
- Material Sourcing: Select high-grade stainless steel (SUS304/SUS316) and test for purity to avoid defects.
- Machining & Forming: Use precision CNC machines to shape hinge leaves and knuckles, ensuring consistent dimensions.
- Heat Treatment: Harden hinge components to enhance strength and fire resistance.
- Surface Finishing: Apply anti-corrosion treatments (e.g., polishing, coating) for durability and aesthetics.
- UL Testing: Sample hinges undergo 3-hour fire tests, load-bearing tests, and wear tests to meet UL certification requirements.
- QC Inspection: Each unit is inspected for fit, finish, and functionality before packaging—our QC team ensures 99.9% defect-free output.
Packaging & Transportation
- Packaging Options: Individual white boxes, color boxes, or bulk carton packing (custom packaging available).
- Selling Units: Sold per piece; bulk orders (1000+ pieces) qualify for discounted pricing.
- Transportation Modes: Ocean, land, air, or express shipping (flexible to meet your timeline).
- Port Options: Ships from Jiangmen, Guangzhou, or Shenzhen ports (closest to our factory for cost efficiency).
- Incoterms: FOB, Express Delivery, CFR, CIF, EXW, FCA, DDP, DDU (choose terms that fit your logistics strategy).
- Payment Terms: L/C (Letter of Credit) or T/T (Telegraphic Transfer) for secure, global transactions.
After-Sales Support
- Warranty Service: 5-year mechanical warranty—we replace or repair defective units free of charge.
- Technical Support: Online support (via email/chat) for installation, troubleshooting, and system compatibility (e.g., pairing with door closers).
- Engineering Solutions: Our team provides graphic design and 3D model design support for custom projects or integration with your door systems.
